It means the event is certain to happen.
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An event with a probability of 001 = 1 is a certainty. The event must happen.
1 means the event is certain to occur.
It is the probability of an event that will definitely happen.
Dependent probability is the probability of an event which changes according to the outcome of some other event.
For any event A, Probability (not A) = 1 - Probability(A)